The cloud sandbox model is the right call for anything longer than ten minutes. Kick off three tasks, go to a meeting, review PRs when you're back. The reviews it writes on other people's PRs are better than most humans' on my team, which is either a compliment to Codex or an insult to my team.
Codex
AI coding agent for features, refactors, reviews, and releases

About Codex
Codex is an AI coding agent from OpenAI for software engineering work, including building features, complex refactors, migrations, pull requests, code reviews, and releases. It is available in ChatGPT and is designed for individual developers and teams.
Codex supports multi-agent workflows with built-in worktrees and cloud environments, allowing agents to work in parallel across projects. Skills let teams provide coding standards and workflows for Codex to apply across tasks.
It can also handle background work such as issue triage, alert monitoring, and CI/CD tasks. Codex is available across ChatGPT, an editor extension, and the terminal through a connected ChatGPT account.
Highlights
- Builds features, refactors code, and performs migrations
- Supports pull requests, code review, testing, and releases
- Provides worktrees and cloud environments for parallel agent workflows
- Includes Skills for team standards and workflows
- Offers scheduled background work for issue triage, monitoring, and CI/CD
This is the one I recommend to friends who are just getting into AI tooling. Low setup friction, sensible defaults, and it stays out of your way.
Excellent core experience. Docking a star because pricing gets steep once you're a heavy user, and the free tier limits hit faster than expected.
Solid but not magic. Works great on greenfield projects; on our legacy monorepo it gets lost and needs a lot of hand-holding. Still worth trying.
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